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Fair Value Measurements (Quantitative Information Level 3 Measurements ) (Details) - Level 3 - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | --- | --- | ---
Convertible preferred securities |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Asset fair value | $ 20,628 | $ 15,424 | $ 15,410 | $ 16,278 | $ 16,946 | $ 16,803 | $ 15,905 | $ 11,618
Implied based on market prices | Convertible preferred securities | Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Asset fair value | 20,628 |  |  | 16,278 | 16,946 |  |  |
Third party appraisal | Grain Assets | Nonrecurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Asset fair value | $ 0 |  |  | $ 9,000 | $ 0 |  |  |

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